Which of the following statements about the lanthanide elements is NOT true?,The most common oxidation state for the lanthanide elements is +3.,Lanthanide complexes often have high coordination numbers (> 6).,All of the lanthanide elements react with aqueous acid to liberate hydrogen.,The atomic radii of the lanthanide elements increase across the period from La to Lu.,D
A 0.217 g sample of HgO (molar mass = 217 g) reacts with excess iodide ions according to the reaction shown above. Titration of the resulting solution requires how many mL of 0.10 M HCl to reach equivalence point?,1.0 mL,10 mL,20 mL,50 mL,C
"Predict the number of lines in the EPR spectrum of a solution of 13C-labelled methyl radical (13CH3•), assuming the lines do not overlap.",4,3,6,24,A
"3 Cl−(aq) + 4 CrO_4^2−(aq) + 23 H+(aq) → 3 HClO2(aq) + 4 Cr3+(aq) + 10 H2O(l). In the reaction shown above, Cl−(aq) behaves as",an acid,a base,a catalyst,a reducing agent,D
"Which of the following lists the hydrides of group-14 elements in order of thermal stability, from lowest to highest?",PbH4 < SnH4 < GeH4 < SiH4 < CH4,PbH4 < SnH4 < CH4 < GeH4 < SiH4,CH4 < SiH4 < GeH4 < SnH4 < PbH4,CH4 < PbH4 < GeH4 < SnH4 < SiH4,A
